CNC Milling | Custom Parts & Production Parts

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CNC Milling Capabilities

Prototyping or scaling production, our precision CNC milling makes your designs come alive with unmatched accuracy and craftsmanship.

3-Axis CNC Milling

Ideal for a wide range of parts, our 3-axis CNC milling offers exceptional accuracy with a perfect balance of accuracy, speed and cost-effectiveness.

4-Axis CNC Milling

As a bridge between 3-axis and 5-axis, 4-axis CNC milling offers enhanced capabilities for complex parts while balancing cost and complexity.

5-Axis CNC Milling

5-axis CNC milling is the best solution for complex geometries parts. The multi-axis capability boosts greater flexibility and precision with production in a single setup.

Tolerances for CNC Milling

CNC milling tolerances define how much deviation is allowed between the designed dimensions and the actual machined part. The tighter the tolerance, the more precise the part—but also the more time—consuming and costly it is to manufacture.

Machine Type	Typical Tolerance Range (Metric)	Typical Tolerance Range (Imperial)	Precision Level	Common Applications
3-Axis CNC	±0.1 mm to ±0.025 mm	±0.004" to ±0.001"	Standard to Medium Precision	Flat surfaces, simple contours, enclosures.
4-Axis CNC	±0.05 mm to ±0.01 mm	±0.002" to ±0.0004"	Medium to High Precision	Parts requiring rotation (e.g., gears, cylindrical parts).
5-Axis CNC	±0.01 mm to ±0.0025 mm	±0.0004" to ±0.0001"	High to Ultra Precision	Complex 3D surfaces, aerospace, medical, motorsports.

CNC Milling Design Guidelines

Read our design guidelines to optimize production efficiency. From precision prototypes to high-volume production runs, our experts offer immediate feedback to ensure optimal results.

Feature	Design Recommendation	Notes/Best Practices
Minimum Wall Thickness	Metal: ≥ 0.8 mm Plastic: ≥ 1.5 mm	Thin walls may vibrate or warp during machining.
Minimum Hole Diameter	≥ 1.0 mm (use standard drill sizes if possible)	Avoid micro-holes unless absolutely necessary, prefer standard tool sizes.
Hole Depth	≤ 4× diameter (for accurate depth)	Deeper holes may require special tools or operations.
Pocket Depth	≤ 4× tool diameter	Deep pockets increase machining time and may reduce accuracy.
Internal Radii	≥ 1.0 mm or use R = tool radius	Sharp corners inside pockets are difficult, use fillets to match cutter radius.
Text/Engraving	Font size ≥ 5 mm Depth ≥ 0.3 mm	Use sans-serif fonts; shallow engraving may not be visible or may wear off.
Tolerances	Use standard: ±0.1 mm unless tighter is needed	Tighter tolerances increase cost and lead time.
Undercuts	Avoid unless using T-slot or lollipop cutters	Add cost and complexity, discuss with machinist if required.
-ed Holes	≥ M3 (or UNC #4) preferred	Small threads are hard to machine and prone to damage.
Part Size	Max: Depends on machine (typ. 1000×500 mm)	Very large parts may require special setups or machines.
Part Orientation	Minimize reorientation	Multi-sided features should be consolidated to reduce setups and maintain precision.

Why Choose Our CNC Milling Services

Alcro is a leading provider of CNC milling services, known for its commitment to precision, speed and quality. When precision, reliability and speed matter, our CNC milling services deliver the quality and performance your project demands.

High Precision Guaranteed
We operate advanced CNC milling machines, capable of achieving tight tolerances (as close as ±0.01 mm) for both simple and highly complex components. Whether you're building functional prototypes or end-use parts, precision is our promise.
Fast Turnaround
Time is critical. Our streamlined production workflow and skilled team ensure your parts are delivered on time—often in as little as 3-7 business days—without compromising quality.
Full Material Versatility
From aluminum, stainless steel and titanium to plastics like ABS, PEEK and Delrin, we support a wide range of materials. This flexibility allows us to meet diverse mechanical, thermal and aesthetic requirements.

Expert Support at Every Step
Not sure how to optimize your part for milling? Our engineering team offers DFM feedback to help you reduce costs and increase efficiency—without compromising function or integrity.
Complex Geometry Support
Thanks to our 5-axis capabilities, we can efficiently machine intricate parts with multi-surface features, undercuts, and tight angles—all in a single setup, reducing handling errors and improving accuracy.
Custom Finishing Services
Need your parts to look as good as they perform? We offer a range of finishing options including anodizing, powder coating, bead blasting, painting and polishing—tailored to your needs.

Turn Your Designs Into Custom Parts Today

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Driven by customer-first mindset, fast response and technical excellence, we are committed to being your reliable, long-term partner in custom manufacturing.

sophia@alcrocn.com

+86 15338350382

6th North Street, Xiagang Community, Chang'an Town, Dongguan City, Guangdong Province, China.

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